Hi, I was really enjoying the game, just destroyed the antena and met with the extraction team. Is this the end of the game? New to Xbox 360 games; can anyone tell me are there more levels? Keep trying to get to another level but it just keeps starting from my...

ive gone right round (or down the wire on top of the roof) and have come across a roof
with three large box looking things which are too high to jump onto though i i can not
find anything to climb etc to get to next part i.e. antenna.

How do you get past the girl who just killed the guy and put him in the dumpster? It says to use the birds to your advantage but that doesnt help me at all, ive tried running past her when she is looking the other way but she turns around to check her surround...

In stage 15 I'm supposed to look for a data disc but I've looked everywhere and haven't found a thing except for a nightwalker and 2 medals and a UV knife..
Can someone please tell me where I could find the disc/how to get there??
Thanks